To find the unit rate of active minutes per class, you can divide the total active minutes by the number of times Justin attended the class.
Justin has a total of 72 active minutes for the week and attended the class 3 times.
Unit rate = Total active minutes / Number of classes Unit rate = 72 active minutes / 3 classes Unit rate = 24 active minutes per class
So, the unit rate of active minutes per class is 24 minutes.